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Intradiploic epidermoid cyst in a dog

Seungmin Lee DVM1, Min Jang DVM, PhD2, F. A. Mann DVM, MS3, Sooyoung Choi DVM, PhD4, Jung Keun Lee DVM, PhD5, and Joon-ki Kim DVM, MS6
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  • 1 1Baron Animal Medical Center, Seoul 02418, Republic of Korea.
  • | 2 2Department of Veterinary Surgery, Haemaru Referral Animal Hospital, Seongnam 13590, Republic of Korea.
  • | 3 3Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211.
  • | 4 4Department of Veterinary Diagnostic Imaging, College of Veterinary Medicine, Kangwon National University, Chuncheon 24341, Republic of Korea.
  • | 5 5Idexx Laboratories, Westbrook, ME 04092.
  • | 6 6Banghak Animal Hospital, Seoul 01350, Republic of Korea.

Abstract

CASE DESCRIPTION

A 10-year-old 7-kg (15.4-lb) neutered male Shih Tzu was referred for evaluation because of a sudden onset of dullness and intermittent vomiting of 1 to 2 weeks’ duration. Two days prior to evaluation, clinical signs had worsened and 1 seizure was reported.

CLINICAL FINDINGS

A 3.5 × 2.5-cm soft, dome-shaped mass of the right occipital region of the head was noted on physical examination. Radiography and CT confirmed the presence of the mass and indicated its intra- and extracranial expansion. The MRI images showed compression of the cerebellum by the mass, with distinct margins of hypointensity on both T1- and T2-weighted images.

TREATMENT AND OUTCOME

Surgery was performed, and the mass was completely excised. The dog had mild ataxia, hypermetria, and head tremors after surgery. Histologic examination of the mass yielded a diagnosis of intradiploic epidermoid cyst. On examination 3 weeks after surgery, the previous neurologic signs had resolved. On examination 25 months after surgery, the dog remained free of clinical signs.

CLINICAL RELEVANCE

The present report described the clinical signs, diagnostic imaging results, and successful surgical removal of an intradiploic epidermoid cyst in a dog. Long-term prognosis may be good with complete removal of intradiploic epidermoid cysts in dogs.

Abstract

CASE DESCRIPTION

A 10-year-old 7-kg (15.4-lb) neutered male Shih Tzu was referred for evaluation because of a sudden onset of dullness and intermittent vomiting of 1 to 2 weeks’ duration. Two days prior to evaluation, clinical signs had worsened and 1 seizure was reported.

CLINICAL FINDINGS

A 3.5 × 2.5-cm soft, dome-shaped mass of the right occipital region of the head was noted on physical examination. Radiography and CT confirmed the presence of the mass and indicated its intra- and extracranial expansion. The MRI images showed compression of the cerebellum by the mass, with distinct margins of hypointensity on both T1- and T2-weighted images.

TREATMENT AND OUTCOME

Surgery was performed, and the mass was completely excised. The dog had mild ataxia, hypermetria, and head tremors after surgery. Histologic examination of the mass yielded a diagnosis of intradiploic epidermoid cyst. On examination 3 weeks after surgery, the previous neurologic signs had resolved. On examination 25 months after surgery, the dog remained free of clinical signs.

CLINICAL RELEVANCE

The present report described the clinical signs, diagnostic imaging results, and successful surgical removal of an intradiploic epidermoid cyst in a dog. Long-term prognosis may be good with complete removal of intradiploic epidermoid cysts in dogs.

Contributor Notes

Address correspondence to Dr. Jang (geamihead@gmail.com).